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Below are two servers with two different results with cpuinfo command. Why one is showing processor 0 to 4 and another showing only 0 and 1.
Both are dual core processor as far my knowledge as they have cpu core '2'.
Now I got another IBM server which shows processor 0 to 7 and cpu core '4'. Does is mean quad core? Also, in dual core processors with HT enable should siblings be showing a value '4' instead of '2'?

Below are two servers with two different results with cpuinfo command. Why one is showing processor 0 to 4 and another showing only 0 and 1.

The first shows processors 0 to 3, representing two physical processors with two cores each.

The second shows one physical processor with two cores.

How many physical processors did you think each has? If the second has two physical, then one is disabled. Check the BIOS settings.
If I'm reading it correctly, both have hyper threading capable hardware but both have hyper threading disabled by the BIOS.

Quote:

Now I got another IBM server which shows processor 0 to 7 and cpu core '4'. Does is mean quad core?

That is quad core. I don't think you gave enough info to distinguish quad core doubled by HT, vs. two physical processors quad core.

Quote:

Also, in dual core processors with HT enable should siblings be showing a value '4' instead of '2'?

Right. If HT is enabled the number of siblings will be double the number of cores.

I haven't seen any consistency between BIOS's for that type of question. All I know how to do is carefully walk the entire menu tree of the BIOS looking. While doing that, also look for any BIOS settings that might turn on "advanced" or "manual" or other modes that might then cause it to display setting choices that are normally hidden. Obviously be more careful what you change inside normally hidden options, but you might need to enable some normally hidden options just to be able to enable HT.